Crabs represent a hugely diverse group including brachyuran crabs, porcelain crabs, lithode crabs, squat lobsters, hermit crabs, and so on. For convenience, they are considered in this single section in the ODYSSEY. Much more work has been done on brachyuran crabs (Dungeness crabs, rock crabs, shore crabs) than on all of the rest of the groups combined.
NOTE references to “crabbe”, “crabban”, and “crabben” are common in English literature dating from as early as the 11th C., doubtless because of their good taste and commercial value. Crabs along with shrimps, hermit crabs, lobsters, and crayfishes are classified in the Order Decapoda in the Subphylum Crustacea
NOTE most applied research on crabs on this coast focuses on Dungeness crabs Metacarcinus magister (formerly Cancer magister) While many studies on this species are included in the ODYSSEY, a huge volume of commercial- and fisheries-oriented research papers is left out. As one example, the California Department of Fish and Game’s excellent Dungeness Crab Research Program (1974-80), published in an entire journal volume, is omitted (Life history, environment, and mariculture studies of the Dungeness crab, Cancer magister, with emphasis on the Central California Fishery Resource, Wild & Tasto, eds. 1983 Calif Fish Bull 172 pp. 1-352). Note that most references to Cancer magister in the ODYSSEY have now been changed to Metacarcinus magister. In retrospect, his may not have been a good idea, for reasons of the confusion it is likely to generate in attempting to use the indexing system. So, when searching for papers dealing with Dungeness crabs, do searches using each genus name.
Another common west-coast cancroid crab with a new genus name is Cancer oregonensis, now changed to Glebocarcinus oregonensis
Phylum Arthropoda (lit. “jointed legs” G.)
Subphylum Crustacea (lit. “crust or rind” L.), referring to the hard calcified exoskeleton
Class Malacostraca includes all the “advanced” crustaceans
Order Decapoda (lit. “ten feet” G.); however, in all groups at least one of the 5 pairs of walking appendages is modified into claws, and in some groups (e.g., lithode crabs and hermit crabs) the 5th pair is modified or lost
Infraorder Brachyura including the so-called “true” crabs (represented by more than 3 dozen common species)
Infraorder Anomura including porcelain, lithode, galatheid, mole, sand, and hermit crabs